[PATCH 17/19] powerpc: create flush_all_to_thread()

Create a single function that flushes everything (FP, VMX, VSX, SPE). Doing this all at once means we only do one MSR write. Signed-off-by: Anton Blanchard <an...@samba.org> --- arch/powerpc/include/asm/switch_to.h | 1 + arch/powerpc/kernel/process.c| 22 ++

[PATCH 18/19] powerpc: Rearrange __switch_to()

Most of __switch_to() is housekeeping, TLB batching, timekeeping etc. Move these away from the more complex and critical context switching code. Signed-off-by: Anton Blanchard <an...@samba.org> --- arch/powerpc/kernel/process.c | 52 +-- 1 file chang

[PATCH 02/19] powerpc: Don't disable MSR bits in do_load_up_transact_*() functions

Similar to the non TM load_up_*() functions, don't disable the MSR bits on the way out. Signed-off-by: Anton Blanchard <an...@samba.org> --- arch/powerpc/kernel/fpu.S| 4 arch/powerpc/kernel/vector.S | 4 2 files changed, 8 deletions(-) diff --git a/arch/powerpc/kernel/f

[PATCH 08/19] powerpc: Remove NULL task struct pointer checks in FP and vector code

We used to allow giveup_*() to be called with a NULL task struct pointer. Now those cases are handled in the caller we can remove the checks. We can also remove giveup_altivec_notask() which is also unused. Signed-off-by: Anton Blanchard <an...@samba.org> --- arch/powerpc/include/asm/switc

[PATCH 12/19] powerpc: Create msr_check_and_{set,clear}()

Create helper functions to set and clear MSR bits after first checking if they are already set. Grouping them will make it easy to avoid the MSR writes in a subsequent optimisation. Signed-off-by: Anton Blanchard <an...@samba.org> --- arch/powerpc/kernel/process.c

[PATCH 13/19] powerpc: Create disable_kernel_{fp,altivec,vsx,spe}()

for a debug boot option that does this and catches bad uses in other areas of the kernel. Signed-off-by: Anton Blanchard <an...@samba.org> --- arch/powerpc/crypto/aes-spe-glue.c | 1 + arch/powerpc/crypto/sha1-spe-glue.c | 1 + arch/powerpc/crypto/sha256-spe-glue.c| 1 + arch/p

[PATCH 14/19] powerpc: Add ppc_strict_facility_enable boot option

Add a boot option that strictly manages the MSR unavailable bits. This catches kernel uses of FP/Altivec/SPE that would otherwise corrupt user state. Signed-off-by: Anton Blanchard <an...@samba.org> --- Documentation/kernel-parameters.txt | 6 ++ arch/powerpc/include/asm/reg.h

[PATCH 05/19] powerpc: Remove UP only lazy floating point and vector optimisations

UP and SMP, but in preparation for that remove these UP only optimisations. Signed-off-by: Anton Blanchard <an...@samba.org> --- arch/powerpc/include/asm/processor.h | 6 -- arch/powerpc/include/asm/switch_to.h | 8 --- arch/powerpc/kernel/fpu.S| 35 --- arch/powerpc/

[PATCH 01/19] powerpc: Don't disable kernel FP/VMX/VSX MSR bits on context switch

microbenchmark using yield(): http://ozlabs.org/~anton/junkcode/context_switch2.c ./context_switch2 --test=yield --fp 0 0 shows an improvement of almost 3% on POWER8. Signed-off-by: Anton Blanchard <an...@samba.org> --- arch/powerpc/kernel/entry_64.S | 15 +-- 1 file changed, 1 ins

[PATCH 06/19] powerpc: Simplify TM restore checks

Instead of having multiple giveup_*_maybe_transactional() functions, separate out the TM check into a new function called check_if_tm_restore_required(). This will make it easier to optimise the giveup_*() functions in a subsequent patch. Signed-off-by: Anton Blanchard <an...@samba.

[PATCH 07/19] powerpc: Create mtmsrd_isync()

mtmsrd_isync() will do an mtmsrd followed by an isync on older processors. On newer processors we avoid the isync via a feature fixup. Signed-off-by: Anton Blanchard <an...@samba.org> --- arch/powerpc/include/asm/reg.h | 8 arch/powerpc/kernel/process.c

[PATCH 09/19] powerpc: Move part of giveup_fpu,altivec,spe into c

Move the MSR modification into new c functions. Removing it from the low level functions will allow us to avoid costly MSR writes by batching them up. Move the check_if_tm_restore_required() check into these new functions. Signed-off-by: Anton Blanchard <an...@samba.org> --- arch/p

[PATCH 15/19] powerpc: Remove fp_enable() and vec_enable(), use msr_check_and_{set, clear}()

More consolidation of our MSR available bit handling. Signed-off-by: Anton Blanchard <an...@samba.org> --- arch/powerpc/include/asm/processor.h | 2 -- arch/powerpc/kernel/fpu.S| 16 arch/powerpc/kernel/process.c| 6 -- arch/powerpc/kernel/ve

[PATCH 16/19] powerpc: create giveup_all()

an improvement of 3% on POWER8. Signed-off-by: Anton Blanchard <an...@samba.org> --- arch/powerpc/include/asm/switch_to.h | 1 + arch/powerpc/kernel/process.c| 75 arch/powerpc/kvm/book3s_pr.c | 17 +--- 3 files changed, 63 insertions(

[PATCH 19/19] powerpc: clean up asm/switch_to.h

Remove a bunch of unnecessary fallback functions and group things in a more logical way. Signed-off-by: Anton Blanchard <an...@samba.org> --- arch/powerpc/include/asm/switch_to.h | 39 ++-- 1 file changed, 11 insertions(+), 28 deletions(-) diff --git

Re: -mprofile-kernel vs. notrace in ppc64(le) Linux kernels

Hi, > On Sat, Sep 26, 2015 at 04:30:08PM +0200, Torsten Duwe wrote: > > As I mentioned earlier this year, it's a bad idea to call _mcount > > from MMU helper functions (e.g. hash_page...), when the > > profiling/tracing/ live-patching/whatever framewok might in turn > > cause another such fault.

Re: [PATCH] purgatory/arch/ppc64: Reset primary cpu endian to big-endian

target kernel can boot whether or not it includes > > FIXUP_ENDIAN. > > > > This mirrors commit 150b14e7 in kexec-lite. > > > > Signed-off-by: Samuel Mendoza-Jonas <sam...@au1.ibm.com> > > I would value a review from one of the PPC folks. Looks good

Re: [kexec-lite 1/3] Add dependencies to the readme

Thanks Joel, all three applied! Anton ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev

Re: RFC: Reducing the number of non volatile GPRs in the ppc64 kernel

Hi, Here is another instruction trace from a kernel context switch trace. Quite a lot of register and CR save/restore code. Regards, Anton c02943d8 fsnotify+0x8 mfcrr12 c02943dc fsnotify+0xc std r20,-96(r1) c02943e0 fsnotify+0x10 std r21,-88(r1)

Re: RFC: Reducing the number of non volatile GPRs in the ppc64 kernel

Hi Bill, Segher, I agree with Segher. We already know we have opportunities to do a better job with shrink-wrapping (pushing this kind of useless activity down past early exits), so having examples of code to look at to improve this would be useful. I'll look out for specific examples. I

RFC: Reducing the number of non volatile GPRs in the ppc64 kernel

is right), but this gives us something to play with. Anton powerpc: Reduce the number of non volatiles GPRs to 8 This requires a hacked gcc. Signed-off-by: Anton Blanchard an...@samba.org -- Index: linux.junk/arch/powerpc/include/asm/exception-64s.h

[PATCH 2/3] powerpc: Create context switch helpers save_sprs() and restore_sprs()

can do. - SPR writes are slow, so check that the value is changing before writing it. A context switch microbenchmark using yield(): http://ozlabs.org/~anton/junkcode/context_switch2.c ./context_switch2 --type=yield 0 0 shows an improvement of almost 10% on POWER8. Signed-off-by: Anton Blanchard

[PATCH 3/3] powerpc: Remove redundant mflr in _switch

No need to execute mflr twice. Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/kernel/entry_64.S | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index 8428280..f8779f2 100644 --- a/arch/powerpc

[PATCH 1/3] powerpc: No need to disable kernel FP/VMX/VSX MSR bits on context switch

/context_switch2.c ./context_switch2 --type=yield --fp 0 0 shows an improvement of almost 3% on POWER8. Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/kernel/entry_64.S | 15 +-- 1 file changed, 1 insertion(+), 14 deletions(-) diff --git a/arch/powerpc/kernel/entry_64

Re: [PATCH] Fix crash due to processing memory-controller nodes as memory

Hi Ian, Nice catch! I wonder if we should be checking for device_type memory. Ben? Yes. That's what Linux does. Ian: I made that change, and slightly modified your commit message. Look ok? Looks good to me :) Excellent, I just pushed the fix. Anton

Re: [PATCH] Fix crash due to processing memory-controller nodes as memory

; ... }; }; }; }; Signed-off-by: Ian Munsie imun...@au1.ibm.com Signed-off-by: Anton Blanchard an...@samba.org --- kexec_memory_map.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/kexec_memory_map.c b/kexec_memory_map.c index fc1b7af..6103590 100644

Re: [PATCH] Fix crash due to processing memory-controller nodes as memory

Hi Ian, From: Ian Munsie imun...@au1.ibm.com If the system has a PCI device with a memory-controller device node, kexec-lite would spew hundreds of double free warnings and eventually segfault. This would result in a kexec load failed message from petitboot. This was due to

Re: [kexec-lite PATCH V2] trampoline: Reset primary cpu endian to big-endian

Hi Scott, Is kexec-lite meant to be specific to book3s-64? It was originally built to test book3s-64 kexec. Likely some other issues need fixing for other ppc sub arches, but it is nice to have a very simple kexec. Anton ___ Linuxppc-dev mailing

Re: [kexec-lite PATCH] trampoline: Reset primary cpu endian to big-endian

Hi Sam, Older big-endian ppc64 kernels don't include the FIXUP_ENDIAN check, meaning if we kexec from a little-endian kernel the target kernel will fail to boot. Returning to big-endian before we enter the target kernel ensures that the target kernel can boot whether or not it includes

[PATCH] powerpc: Remove mtmsrd(), use existing mtmsr()

mtmsr() does the right thing on 32bit and 64bit, so use it everywhere. Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/include/asm/reg.h | 3 +-- arch/powerpc/oprofile/op_model_power4.c | 4 ++-- 2 files changed, 3 insertions(+), 4 deletions(-) diff --git a/arch/powerpc

[PATCH] powerpc: Add plain English description for alignment exception oopses

If we take an alignment exception which we cannot fix, the oops currently prints: Unable to handle kernel paging request for unknown fault Lets print something more useful: Unable to handle kernel paging request for unaligned access at address 0xc000f77bba8f Signed-off-by: Anton Blanchard

Re: [RFC PATCH] powerpc/numa: initialize distance lookup table from drconf path

Hi Nikunj, Thanks for the patch. Have we tested that this doesn't regress the non dynamic representation? Yes, that is tested. And works as expected. Great, you can add: Acked-by: Anton Blanchard an...@samba.org Anton ___ Linuxppc-dev mailing

Re: [RFC PATCH] powerpc/numa: initialize distance lookup table from drconf path

Hi Nikunj, From: Nikunj A Dadhania nik...@linux.vnet.ibm.com powerpc/numa: initialize distance lookup table from drconf path In some situations, a NUMA guest that supports ibm,dynamic-memory-reconfiguration node will end up having flat NUMA distances between nodes. This is because of two

[PATCH] powerpc: Fix duplicate const clang warning in user access code

__typeof__(*(ptr)), which will hit the warning if ptr is marked const. Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/include/asm/uaccess.h | 8 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h

Re: [PATCH] powerpc/perf: Fix book3s kernel to userspace backtraces

Hi Laurentiu, + if ((TRAP(regs) == 0xf00) regs-result) + return true; + + return false; Why not just return (TRAP(regs) == 0xf00) regs-result; Could do, it just read a little easier to my tired eyes. Anton ___

[PATCH 0/6] Build ppc64le kernel with llvm/clang

upstream to fix them. Anton Blanchard (6): powerpc: Fix duplicate const clang warning in user access code powerpc: Only use -mabi=altivec if toolchain supports it powerpc: Only use -mtraceback=no, -mno-string and -msoft-float if toolchain supports it powerpc: Don't use -mno-strict-align

[PATCH 4/6] powerpc: Don't use -mno-strict-align on clang

We added -mno-strict-align in commit f036b3681962 (powerpc: Work around little endian gcc bug) to fix gcc bug http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57134 Clang doesn't understand it. We need to use a conditional because we can't use the simpler call cc-option here. Signed-off-by: Anton

[PATCH 5/6] powerpc: Don't use gcc specific options on clang

Add a conditional around the code to select various gcc only options: -mabi=elfv2 vs -mcall-aixdesc, and -mcmodel=medium vs -mminimal-toc. Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/Makefile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/powerpc/Makefile b/arch

[PATCH 2/6] powerpc: Only use -mabi=altivec if toolchain supports it

The -mabi=altivec option is not recognised on LLVM, so use call cc-option to check for support. Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/lib/Makefile | 2 +- lib/raid6/Makefile| 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/lib

[PATCH 3/6] powerpc: Only use -mtraceback=no, -mno-string and -msoft-float if toolchain supports it

These options are not recognised on LLVM, so use call cc-option to check for support. Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/Makefile | 7 --- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index 7a0daad

[PATCH 6/6] llvm: A few Makefile hacks

llvm accepts -fno-delete-null-pointer-checks but complains about it. Wrap it to avoid getting enormous numbers of warnings. Also add -no-integrated-as to disable the llvm integrated assembler, lots of stuff currently relies on gas. --- Makefile | 5 + 1 file changed, 5 insertions(+) diff

[PATCH 1/6] powerpc: Fix duplicate const clang warning in user access code

Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/include/asm/uaccess.h | 8 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h index a0c071d..2a8ebae 100644 --- a/arch/powerpc/include/asm

[PATCH 2/2] powerpc: Non relocatable system call doesn't need a trampoline

We need to use a trampoline when using LOAD_HANDLER(), because the destination needs to be in the first 64kB. An absolute branch has no such limitations, so just jump there. Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/kernel/exceptions-64s.S | 2 +- 1 file changed, 1

[PATCH 1/2] powerpc: Relocatable system call no longer uses the LR

restoring. Remove the stale comment and the restore of the LR. Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/kernel/exceptions-64s.S | 16 1 file changed, 4 insertions(+), 12 deletions(-) diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel

[PATCH] powerpc/perf: Fix book3s kernel to userspace backtraces

| | do_vfs_ioctl | | sys_ioctl | | system_call | | __ioctl | | 0x7e714 | | 0x7e714 Signed-off-by: Anton

Re: [PATCH 1/2] powerpc/configs: merge pseries_defconfig and pseries_le_defconfig

Hi Cyril, These two configs should be identical with the exception of big or little endian The big endian version has XMON_DEFAULT turned on while the little endian has XMON_DEFAULT not set. Enable XMON_DEFAULT for little endian. I disabled it on the LE defconfig on purpose. In most cases

Re: [PATCH V3 09/13] selftests, powerpc: Add test for DSCR value inheritence across fork

restore the DSCR on exit. I'm not sure we need to go to the trouble of saving and restoring it, but we should at least get it back to 0 when done. Also a tiny nit, no need for a newline in perror(): open() failed : Permission denied With those changes you can add: Signed-off-by: Anton Blanchard

[PATCH] powerpc: Align TOC to 256 bytes

...@vger.kernel.org Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/kernel/vmlinux.lds.S | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S index f096e72..1db6851 100644 --- a/arch/powerpc/kernel/vmlinux.lds.S +++ b/arch/powerpc

[PATCH] powerpc/config: Enable bnx2x on ppc64 and pseries defconfigs

Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/configs/ppc64_defconfig | 1 + arch/powerpc/configs/pseries_defconfig| 1 + arch/powerpc/configs/pseries_le_defconfig | 1 + 3 files changed, 3 insertions(+) diff --git a/arch/powerpc/configs/ppc64_defconfig b/arch/powerpc

[PATCH] powerpc/perf: Cap 64bit userspace backtraces to PERF_MAX_STACK_DEPTH

We cap 32bit userspace backtraces to PERF_MAX_STACK_DEPTH (currently 127), but we forgot to do the same for 64bit backtraces. Cc: sta...@vger.kernel.org Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/perf/callchain.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff

[PATCH] powerpc/config: Enable bnx2x on ppc64 and pseries defconfigs

Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/configs/ppc64_defconfig | 1 + arch/powerpc/configs/pseries_defconfig| 1 + arch/powerpc/configs/pseries_le_defconfig | 1 + 3 files changed, 3 insertions(+) diff --git a/arch/powerpc/configs/ppc64_defconfig b/arch/powerpc

[PATCH 3/3] powerpc: Include linux/jump_label.h to get HAVE_JUMP_LABEL define

(powerpc/jump_label: Use HAVE_JUMP_LABEL) Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/platforms/powernv/opal-wrappers.S | 2 +- arch/powerpc/platforms/pseries/hvCall.S| 2 +- arch/powerpc/platforms/pseries/lpar.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions

[PATCH 2/2] powerpc: Add ppc64 hard lockup detector support

might take multiple PMU exceptions per second per hardware thread even if our hard lockup timeout is 10 seconds. It can be enabled via a boot option, or via procfs. Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/Kconfig | 1 + arch/powerpc/include/asm/nmi.h | 4

[PATCH 2/3] jump_label: Allow jump labels to be used in assembly

To use jump labels in assembly we need the HAVE_JUMP_LABEL define, so we select a fallback version if the toolchain does not support them. Modify linux/jump_label.h so it can be included by assembly files. We also need to add -DCC_HAVE_ASM_GOTO to KBUILD_AFLAGS. Signed-off-by: Anton Blanchard

[PATCH 1/2] oprofile: Disable oprofile NMI timer on ppc64

for OPROFILE_NMI_TIMER to disable it on PPC64. Signed-off-by: Anton Blanchard an...@samba.org --- arch/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/Kconfig b/arch/Kconfig index 05d7a8a..0cc605d 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -32,7 +32,7 @@ config

[PATCH 1/3] jump_label: Allow asm/jump_label.h to be included in assembly

ARCH_STATIC_BRANCH in the powerpc asm/jump_label.h for an example). Signed-off-by: Anton Blanchard an...@samba.org --- arch/arm/include/asm/jump_label.h | 5 ++--- arch/arm64/include/asm/jump_label.h | 8 arch/mips/include/asm/jump_label.h | 7 +++ arch/s390/include/asm/jump_label.h

[PATCH 3/3] powerpc: Include linux/jump_label.h to get HAVE_JUMP_LABEL define

(powerpc/jump_label: Use HAVE_JUMP_LABEL) Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/platforms/powernv/opal-wrappers.S | 2 +- arch/powerpc/platforms/pseries/hvCall.S| 2 +- arch/powerpc/platforms/pseries/lpar.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions

[PATCH 2/3] jump_label: Allow jump labels to be used in assembly

To use jump labels in assembly we need the HAVE_JUMP_LABEL define, so we select a fallback version if the toolchain does not support them. Modify linux/jump_label.h so it can be included by assembly files. We also need to add -DCC_HAVE_ASM_GOTO to KBUILD_AFLAGS. Signed-off-by: Anton Blanchard

[PATCH 1/3] jump_label: Allow asm/jump_label.h to be included in assembly

ARCH_STATIC_BRANCH in the powerpc asm/jump_label.h for an example). Signed-off-by: Anton Blanchard an...@samba.org --- arch/arm/include/asm/jump_label.h | 5 ++--- arch/arm64/include/asm/jump_label.h | 8 arch/mips/include/asm/jump_label.h | 7 +++ arch/s390/include/asm/jump_label.h

[PATCH 7/7] powerpc: Serialise BUG and WARNs with die_spin_lock_{irqsave, irqrestore}

A simple kernel module was used to create concurrent WARNs and BUGs: http://ozlabs.org/~anton/junkcode/warnstorm.tar.gz Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/kernel/traps.c | 44 1 file changed, 36 insertions(+), 8 deletions

[PATCH 6/7] dump_stack: Serialise dump_stack with die_spin_lock_{irqsave, irqrestore}

Remove another version of a recursive lock in dump_stack. Signed-off-by: Anton Blanchard an...@samba.org --- lib/dump_stack.c | 40 1 file changed, 4 insertions(+), 36 deletions(-) diff --git a/lib/dump_stack.c b/lib/dump_stack.c index 6745c62..f64ee3c

[PATCH 0/7] Serialise oopses, BUGs, WARNs, dump_stack, soft lockups and hard lockups

the series: A trivial module to create concurrent WARNs, BUGs and oopses: http://ozlabs.org/~anton/junkcode/warnstorm.tar.gz And one to create concurrent soft and hard lockups: http://ozlabs.org/~anton/junkcode/badguy.tar.gz Anton Blanchard (7): Add die_spin_lock_{irqsave,irqrestore

[PATCH 1/7] Add die_spin_lock_{irqsave,irqrestore}

Many architectures have their own oops locking code that allows the lock to be taken recursively. Create a common version. Avoid creating generic locking functions, so they can't be abused in other parts of the kernel. Signed-off-by: Anton Blanchard an...@samba.org --- include/linux/die_lock.h

[PATCH 2/7] powerpc: Use die_spin_lock_{irqsave,irqrestore}

Replace the powerpc specific oops locking with the common one. Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/kernel/traps.c | 24 +++- 1 file changed, 3 insertions(+), 21 deletions(-) diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c

[PATCH 3/7] arm: Use die_spin_lock_{irqsave,irqrestore}

Replace the ARM specific oops locking with the common one. Signed-off-by: Anton Blanchard an...@samba.org --- arch/arm/kernel/traps.c | 26 +++--- 1 file changed, 3 insertions(+), 23 deletions(-) diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 788e23f

[PATCH 4/7] x86: Use die_spin_lock_{irqsave,irqrestore}

Replace the x86 specific oops locking with the common one. Signed-off-by: Anton Blanchard an...@samba.org --- arch/x86/kernel/dumpstack.c | 26 +++--- 1 file changed, 3 insertions(+), 23 deletions(-) diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c

[PATCH 5/7] watchdog: Serialise soft lockup errors with die_spin_lock_{irqsave, irqrestore}

A simple kernel module was used to create concurrent soft and hard lockups: http://ozlabs.org/~anton/junkcode/badguy.tar.gz Signed-off-by: Anton Blanchard an...@samba.org --- kernel/watchdog.c | 4 1 file changed, 4 insertions(+) diff --git a/kernel/watchdog.c b/kernel/watchdog.c index

[PATCH 1/2] powerpc: Change vrX register defines to vX to match gcc and glibc

is the VMX register definitions - the kernel uses vrX whereas both gcc and glibc use vX. Change the kernel to match userspace. Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/include/asm/ppc_asm.h | 64 +++--- arch/powerpc/include/uapi/asm/ptrace.h | 2

[PATCH 2/2] powerpc: Change vsrX register defines to vsX to match gcc and glibc

is the VSX register definitions - the kernel uses vsrX whereas gcc uses vsX. Change the kernel to match userspace. Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/include/asm/ppc_asm.h | 128 ++--- arch/powerpc/lib/ldstfp.S | 6 +- 2 files changed

Re: [PATCH] powerpc/mm: Add trace point for tracking hash pte fault

Hi Aneesh, yes. We do use jump label. I also verified that looking at .s #APP # 23 ./arch/powerpc/include/asm/jump_label.h 1 1: nop .pushsection __jump_table, aw .llong 1b, .L201, __tracepoint_hash_fault+8 #, .popsection # 0 2 So we

Re: [PATCH] powerpc/mm: Add trace point for tracking hash pte fault

Hi, ebizzy with -S 30 -t 1 -P gave 13627 records/s - Without patch 13546 records/s - With patch with tracepoint disabled OK. So that's about -0.6%. Are we happy with that? I'm not sure. Can you do a few more runs and see if that's a stable result. Surprisingly large. Is

Re: [PATCH 1/2] oprofile: Add HAVE_OPROFILE_NMI_TIMER

Hi Robert, I also don't see a reason, why you don't want to support oprofile NMI timer. Is there any? I couldn't come up with a case where it would be a benefit to us. We roll out PMU support for a new CPU early so that the kernel and tools support it when we GA. On the other hand adding

[PATCH 1/2] oprofile: Add HAVE_OPROFILE_NMI_TIMER

HAVE_PERF_EVENTS_NMI is used for two things - the oprofile NMI timer and the hard lockup detector. Create HAVE_OPROFILE_NMI_TIMER so an architecture can select them separately. On ppc64 we want to add the hard lockup detector, but not the oprofile NMI timer fallback. Signed-off-by: Anton

Re: [PATCH 1/2] powerpc: Add 64bit optimised memcmp

Hi Arnd, Would it help to also add a way for an architecture to override memcmp_pages() with its own implementation? That way you could skip the unaligned part, hardcode the loop counter and avoid the preempt_disable() in kmap_atomic(). Good idea. We could also have a generic implementation

[PATCH 2/2] powerpc: Add ppc64 hard lockup detector support

might take multiple PMU exceptions per second per hardware thread even if our hard lockup timeout is 10 seconds. It can be enabled via a boot option, or via procfs. Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/Kconfig | 1 + arch/powerpc/include/asm/nmi.h | 4

[PATCH 1/2] oprofile: Add HAVE_OPROFILE_NMI_TIMER

HAVE_PERF_EVENTS_NMI is used for two things - the oprofile NMI timer and the hardlockup detector. Create HAVE_OPROFILE_NMI_TIMER so an architecture can select them separately. On ppc64 we want to add the hardlockup detector, but not the oprofile NMI timer fallback. Signed-off-by: Anton Blanchard

[PATCH 1/2] powerpc: Add 64bit optimised memcmp

. Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/lib/Makefile| 3 +- arch/powerpc/lib/memcmp_64.S | 233 +++ arch/powerpc/lib/string.S| 2 + 3 files changed, 237 insertions(+), 1 deletion(-) create mode 100644 arch/powerpc/lib

[PATCH 2/2] powerpc: Add memcmp testcase

Add a testcase for the new ppc64 memcmp. Signed-off-by: Anton Blanchard an...@samba.org --- .../testing/selftests/powerpc/stringloops/Makefile | 21 + .../selftests/powerpc/stringloops/asm/ppc_asm.h| 7 ++ .../selftests/powerpc/stringloops/memcmp_64.S | 1 + .../selftests

[PATCH 2/7] powerpc: Enable on demand governor on ppc64_defconfig

This was enabled on the pseries defconfigs recently, but missed the ppc64 one. Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/configs/ppc64_defconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/powerpc/configs/ppc64_defconfig b/arch/powerpc/configs/ppc64_defconfig

[PATCH 1/7] powerpc: regenerate ppc64 and pseries defconfigs

Regenerate defconfigs using make savedefconfig. Anton Blanchard an...@samba.org --- arch/powerpc/configs/ppc64_defconfig | 11 +-- arch/powerpc/configs/pseries_defconfig| 12 +++- arch/powerpc/configs/pseries_le_defconfig | 14 +++--- 3 files changed, 7

[PATCH 6/7] powerpc: Enable various container features on pseries defconfigs.

Enable config options required by lxc and docker. Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/configs/pseries_defconfig| 12 arch/powerpc/configs/pseries_le_defconfig | 12 2 files changed, 24 insertions(+) diff --git a/arch/powerpc/configs

[PATCH 5/7] powerpc: Enable overlayfs on pseries and ppc64 defconfigs

Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/configs/ppc64_defconfig | 1 + arch/powerpc/configs/pseries_defconfig| 1 + arch/powerpc/configs/pseries_le_defconfig | 1 + 3 files changed, 3 insertions(+) diff --git a/arch/powerpc/configs/ppc64_defconfig b/arch/powerpc

[PATCH 7/7] powerpc: enable CONFIG_NETFILTER_XT_MARK

docker requires CONFIG_NETFILTER_XT_MARK to be enabled. Unfortunately that means turning on CONFIG_NETFILTER_ADVANCED. Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/configs/pseries_defconfig| 22 +- arch/powerpc/configs/pseries_le_defconfig | 22

[PATCH 4/7] powerpc: Enable KSM on pseries and ppc64 defconfigs

KSM will only be used on areas marked for merging via madvise, and it is showing nice improvements on KVM workloads, so enable it by default. Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/configs/ppc64_defconfig | 1 + arch/powerpc/configs/pseries_defconfig| 1 + arch

[PATCH 3/7] powerpc: Enable CONFIG_SATA_AHCI on pseries and ppc64 defconfigs

We are starting to see ppc64 boxes with SATA AHCI adapters in it, so enable it in our defconfigs. Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/configs/ppc64_defconfig | 1 + arch/powerpc/configs/pseries_defconfig| 1 + arch/powerpc/configs/pseries_le_defconfig | 1

Re: [PATCH 1/2] powerpc: Add 64bit optimised memcmp

Hi David, The unrolled loop (deleted) looks excessive. On a modern cpu with multiple execution units you can usually manage to get the loop overhead to execute in parallel to the actual 'work'. So I suspect that a much simpler 'word at a time' loop will be almost as fast - especially in the

[PATCH 1/2] powerpc: Add 64bit optimised memcmp

Just over 17x faster. Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/lib/Makefile| 3 +- arch/powerpc/lib/memcmp_64.S | 233 +++ arch/powerpc/lib/string.S| 2 + 3 files changed, 237 insertions(+), 1 deletion(-) create mode

[PATCH 2/2] powerpc: Add memcmp testcase

Add a testcase for the new ppc64 memcmp. Signed-off-by: Anton Blanchard an...@samba.org --- .../testing/selftests/powerpc/stringloops/Makefile | 21 + .../selftests/powerpc/stringloops/asm/ppc_asm.h| 7 ++ .../selftests/powerpc/stringloops/memcmp_64.S | 1 + .../selftests

Re: [PATCH 1/2] jump_label: Allow jump labels to be used in assembly

Hi Steve, Have you tested this on other archs? Because just looking at x86, it doesn't seem that asm/jump_label.h can handle being called in assembly. Since no one is including linux/jump_label.h in assembly yet, nothing should break. We could however add __ASSEMBLY__ protection to all the

[PATCH 1/3] jump_label: Allow asm/jump_label.h to be included in assembly

ARCH_STATIC_BRANCH in the powerpc asm/jump_label.h for an example). Signed-off-by: Anton Blanchard an...@samba.org --- arch/arm/include/asm/jump_label.h | 5 ++--- arch/arm64/include/asm/jump_label.h | 8 arch/mips/include/asm/jump_label.h | 7 +++ arch/s390/include/asm/jump_label.h

[PATCH 2/3] jump_label: Allow jump labels to be used in assembly

To use jump labels in assembly we need the HAVE_JUMP_LABEL define, so we select a fallback version if the toolchain does not support them. Modify linux/jump_label.h so it can be included by assembly files. We also need to add -DCC_HAVE_ASM_GOTO to KBUILD_AFLAGS. Signed-off-by: Anton Blanchard

[PATCH 3/3] powerpc: Include linux/jump_label.h to get HAVE_JUMP_LABEL define

(powerpc/jump_label: Use HAVE_JUMP_LABEL) Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/platforms/powernv/opal-wrappers.S | 2 +- arch/powerpc/platforms/pseries/hvCall.S| 2 +- arch/powerpc/platforms/pseries/lpar.c | 1 + 3 files changed, 3 insertions(+), 2 deletions

[PATCH] powernv: Fix OPAL tracepoint code

(powernv: Add OPAL tracepoints) Cc: sta...@vger.kernel.org # v3.17+ Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/platforms/powernv/opal-wrappers.S | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal

[PATCH 1/2] jump_label: Allow jump labels to be used in assembly

To use jump labels in assembly we need the HAVE_JUMP_LABEL define, so we select a fallback version if the toolchain does not support them. Modify linux/jump_label.h so it can be included by assembly files. We also need to add -DCC_HAVE_ASM_GOTO to KBUILD_AFLAGS. Signed-off-by: Anton Blanchard

[PATCH 2/2] powerpc: Include linux/jump_label.h to get HAVE_JUMP_LABEL define

(powerpc/jump_label: Use HAVE_JUMP_LABEL) Signed-off-by: Anton Blanchard an...@samba.org --- arch/powerpc/platforms/pseries/hvCall.S | 2 +- arch/powerpc/platforms/pseries/lpar.c | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/platforms/pseries/hvCall.S b/arch/powerpc

Re: [PATCH 1/3] powerpc: Don't use local named register variable in current_thread_info

Hi Alan, Right. This is really an rs6000 backend bug. We describe one of the indirect calls that go wrong here as (call_insn 108 107 109 13 (parallel [ (set (reg:DI 3 3) (call (mem:SI (reg:DI 288) [0 *_67 S4 A8]) (const_int 64 [0x40])))

Re: [1/5] powerpc: Fix handling of DSCR related facility unavailable exception

Hi Anshuman, Yeah I wanted to convert all these tests which are related to DSCR into individual self tests for powerpc. All these test cases have Anton Blanchard and IBM's copyright on it but they are licensed with GPL V2. Not sure whether Anton needs to okay this before I can modify them

Re: [PATCH 1/3] powerpc: Don't use local named register variable in current_thread_info

On Thu, 18 Dec 2014 16:11:54 +1100 Michael Ellerman m...@ellerman.id.au wrote: On Wed, 2014-12-17 at 02:16 +0100, Alexander Graf wrote: On 31.10.14 04:47, Anton Blanchard wrote: LLVM doesn't support local named register variables and is unlikely to. current_thread_info is using one, fix

Re: [PATCH 1/3] powerpc: Don't use local named register variable in current_thread_info

Hi Alex, Git bisect managed to point me to this commit as the offender for OOPSes on e5500 and e6500 (and maybe the G4 as well, not sure). Doing a git revert of this commit on top of linus/master makes things work fine for me again. Ouch, sorry for that, I'll work to reproduce. What gcc

Re: [PATCH] kthread: kthread_bind fails to enforce CPU affinity (fixes kernel BUG at kernel/smpboot.c:134!)

Hi Ingo, So we cannot call set_task_cpu() because in the normal life time of a task the -cpu value gets set on wakeup. So if a task is blocked right now, and its affinity changes, it ought to get a correct -cpu selected on wakeup. The affinity mask and the current value of -cpu getting

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